Describe data structures used during passes of assembler, Computer Engineering

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Describe Data structures used during passes of assembler and their use.

During passes of assembler, the Data structures define as:

Pass 1 data base

Input source program
A location counters (LC)
A machine-operation table (i.e. MOT), which indicates the symbolic mnemonic for each instruction and instruction's length.
Pseudo- operation table
Symbol table
Literal table
Copy of the input to be used later through pass 2

Pass 2

Coping of source program input to pass 1
Location counter (LC)
MOT
POT
ST
Base table which indicates that registers are currently identified as base register.
A work space, INST, which used to hold instruction as its different parts are being assembled together
Punch line, utilized to produce a printed listing.
Punch card used for converting assembled instructions in the format required by the loader.

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